Re: So what's null then if it's not nothing?
Date: Wed, 23 Nov 2005 09:01:40 -0000
<michael_at_preece.net> wrote in message
> This just seems plain wrong to me. It surely is an empty set - or an
> empty thing. The thing surely exists.
No it doesn't, or at least not the way null columns in SQL databases are almost universally used. Many (perhaps most) of the databases I look at have at least a few table that mix multiple entity types in one table, and then count on being able to use nulls to insert a row where the thing does *not* logically exist.
I think this is a fundamentally different (mis-)use of nulls.
Roy Received on Wed Nov 23 2005 - 10:01:40 CET